Oof, the unopened backup box is a classic tragedy. Look, ignore the theoretical debates for a second.
Leave that drive UNPLUGGED. Do not boot into Windows with it attached, because Windows will run scheduled optimization defrag/TRIM in the background and seal the deal. If this data is worth thousands of dollars to you, stop DIYing right now and send it to a professional lab with a PC 3000 Flash recovery setup. They can sometimes dump the NAND chips directly or bypass the FTL controller before background garbage collection kicks in. If you absolutely must DIY, clone it sector by sector first using an offline hardware duplicator or a Linux live USB, never scan the live drive.